Goodreads - See what your friends are reading.
Stampsy - A single place to share, curate and discover visual content
LibraryThing - A home for your books.
Plates - For creating visual stories with people that matter to you !
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Imig.es - Imig.es is a versatile utility that offers you to make your own desired gallery without any effort.